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Mechanisms-for-a-closed-loop-head-positioner-for-streaming-tape-drives

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Mechanisms for a closed loop head positioner for streaming tape drives

Details

Inventors: Nayak, Ashok B.; Schilling, Donald;
Assignee: Archive Corporation (Costa Mesa, CA)
Primary Examiner: Smith; Jerry
Assistant Examiner: Garland; Steven R.
Attorney, Agent or Firm: Roberts and Quiogue

Tape head positioning apparatus that includes a head carriage frame and a parallel beam positioning structure supported by the head carriage for supporting the magnetic tape head and for variably positioning the magnetic tape head relative to the carriage along a path generally transverse to the tape travel direction. The parallel beam positioning structure includes parallel support beams secured at their ends to the head carriage. The magnetic tape head is secured between the bender beam at a location generally between their ends. In a particular embodiment of the parallel beam positioning apparatus, the parallel support beams comprise first and second resilient reed beams having their ends secured to the head carriage and configured to be deflectable in a direction transverse to the tape travel direction. A voice coil linear motor deflects the reed beams pursuant to a control signal to move the magnetic tape head along the path transverse to the tape travel direction. In a further embodiment of the parallel beam positioning apparatus, the support beams comprise first and second parallel piezoelectric bender beams having their ends secured to the head carriage and configured to deflect in a direction transverse to the tape travel direction in response to a control signal. Deflection of the bender beams pursuant to the control signal displaces the magnetic tape head along the path transverse to the tape travel direction.

DETAILED DESCRIPTION OF THE DISCLOSURE In the following detailed description and in the several figures of the drawing, like elements are identified with like reference numerals.
FIG.
1 illustrates a tape drive 10 which is utilized to write and read a magnetic tape 11 stored in a tape cartridge 13.
A magnetic tape head 15 engages the tape 11 which is moved across the face of the head for writing data to the tape and for reading data from the tape.
The magnetic tape head 15 is supported by a head carriage 17 that is moved transversely across the tape by rotation of a lead screw 19.
The lead screw 19 is rotated by a stepper motor 21 via a pinion gear 25 that is fixed to the output shaft of the stepper motor and engaged with an anti-backlash gear 23 that is fixed to the lead screw 19.
The lead screw is 19 supported by bearings secured to the drive frame, and the stepper motor is also secured to the drive frame, so as to provide for a rigid and fixed relation between the lead screw and the stepper motor output shaft.
Referring more particularly to FIGS.
2, 3, and 4, the head carriage 17 includes a base section 27 which includes an internally threaded aperture for engaging the lead screw 19.
A laterally extending anti-rotation arm 29 integral with the base section 27 includes an aperture or slot which engages an anti-rotation shaft 31 mounted in the drive frame.
The engagement of the anti-rotation arm 29 on the anti-rotation shaft 31 prevents rotation of the head carriage 17 while permitting displacement thereof transversely to the tape travel direction pursuant to the rotation of the lead screw.
For convenience, the direction of tape travel is indicated by an X axis, while the transverse direction in which the magnetic tape head travels is indicated by a Y axis that is perpendicular to the X axis.
The carriage 17 further includes a laterally extending support arm 33 that includes at the ends thereof opposing support blocks 35 spaced from each other and generally aligned along the direction of tape travel

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